Dark Matter Search Results from the Complete Exposure of the PICO-60 C3F8 Bubble Chamber
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2019-07
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American Physical Society
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Final results are reported from operation of the PICO-60 C3F8 dark matter detector, a bubble chamber filled with 52 kg of C3F8 located in the SNOLAB underground laboratory. The chamber was operated at thermodynamic thresholds as low as 1.2 keV without loss of stability. A new blind 1404-kg-day exposure at 2.45 keV threshold was acquired with approximately the same expected total background rate as the previous 1167-kg-day exposure at 3.3 keV. This increased exposure is enabled in part by a new optical tracking analysis to better identify events near detector walls, permitting a larger fiducial volume. These results set the most stringent direct-detection constraint to date on the weakly interacting massive particle (WIMP)-proton spin-dependent cross section at 3.2×10-41 cm2 for a 25 GeV WIMP, improving on previous PICO results for 3-5 GeV WIMPs by an order of magnitude.
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Amole, C., et al. “Dark Matter Search Results from the Complete Exposure of the PICO-60 C3F8 Bubble Chamber.” Physical Review D, vol. 100, no. 2, American Physical Society, July 2019, p. 022001, doi:10.1103/PhysRevD.100.022001.
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